Graduate Management Admission Test (GMAT)
Tip
Remember the order of the coordinates with this phrase:
'along the corridor and up the stairs'
Distance between points - calculate using Pythagorean Theorem. Draw one line between the 2 points, another directly down from the higher point and a third from the lower point towards the vertical line. This will create a triangle - 2 sides of which you can calculate the lengths of from the graph itself. Then use Pythagorean Theorem to calculate the length of the third side, which is also the distance between the 2 points.
Equations of lines:
y = mx + b
where m is the slope of the line, b is the y intercept of the line (where it crossed the y axis).
Word Problems
As well as the topics above, the GMAT will ask questions on such 'real world' subjects as rate and interest.
Rate
Rate x Time = Distance. Remember that when averages are introduced, do not 'average the averages'. Instead, you must work out the average over the whole time/distance, etc.
Work
These are generally of the format 'If Bob and Sam can build a fence in 2 hours and Sam alone takes 3 hours, how long would it take Bob alone to build a similar fence?'
Use the formula: |
1 |
+ |
1 |
= |
1 |
where a is the length of time it takes Sam to build the |
|
a |
b |
c |
|||||
|
|
|
|
fence, b is the length of time it takes Sam and c is the total time when they work together.
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04/30/02
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